Armfield Instruction Manual
88
Decrease the outflow rate by completely closing the drain valve in the base of the
vessel. This will decrease the outflow rate compared to the inflow rate.
Continue to control of the valve SOL 2 to maintain fluid height in the process vessel.
Increase the outflow rate compared to the inflow rate by fully opening the drain valve.
Select the
icon to finish data logging.
Create a new results sheet by selecting the
icon in the tool bar of the software.
Return the drain valve to a partially closed position.
Effect of Vessel Volume
In the software, set the PSV to 0%. This will stop flow into the large process vessel.
Fully open the drain valve in the base of the large process vessel and allow the water
to drain from the vessel.
Carefully remove the lid on top of the large process vessel, and fit the removable
inner cylinder, pressing it down firmly to seal the bottom edge. This reduces the
effective volume of the process vessel.
Replace the lid and partially close the drain valve.
Select the
icon to begin data logging.
Maintain the fluid level at the Set Point by controlling valve SOL 2.
Select the
icon to finish data logging.
Create a new results sheet by selecting the
icon in the tool bar of the software.
If there is sufficient laboratory time then the investigations of disturbances, feed rate
and inlet/outlet flow rates may be repeated at this reduced volume.
Results
For easy identification or results, it is suggested that each results sheet is renamed
with a descriptive title (e.g. ‘Feed Rate’, ‘Volume’, etc.). The entire workbook should
be saved with a suitable filename for future reference (e.g. PCT40 Exercise H).
Each set of data should be plotted on a graph of fluid level against time.
Make a comparison of each variation in the experimental conditions against the
results for basic manual control during the first part of the exercise.
Retain the results for comparison with automated control as in the following exercise.
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